Well, regardless of your fanboyism, Rikimaru is objectively much better at being a ninja than Ryu could ever hope to be.
Hey, Irony. It's been awhile. Wussup?
Taking each other head on? Absolutely. Ryu and ayane are devastating battle mages.
But rikimaru and ayame are ninja. They don't battle head on, they assassinate lol. Ryu and ayane wouldn't even see them coming.
When's the last time you saw someone successfully sneak up on Ryu and take a good shot at him?
I can recall numerous times where Ryu has sneaked up on other people and killed them swiftly, silently and deadly, as well as any other ninja could. Can't recall a time where he was the victim of such an attack, though.
Ryu can do the "sneaky ninja" thing as well as any other ninja. He just doesn't do it much because he doesn't have to. The pinnacle of other ninjas' abilities are just a side asset on his toolbelt.
Again, I'm not making Ryu up to be better than he is. I didn't make the bastard canon OP. That's entirely Team Ninja's doing. I just happen to have observed that they've tossed him in so many situations and have given him almost every ability imaginable to a ninja in order to overcome them. If you can think of some ninja doing some cool shit, chances are pretty damn high Ryu's done it or something to the same effect.